Jannik Sinner just got the ultimate nod from Aussie speedster De Minaur, who called him the master of mental toughness. Even after a tough French Open loss, Sinner bounced back to claim Wimbledon and took down his big rival, Carlitos, at the ATP Finals in front of a roaring Italian crowd. De Minaur says Sinner’s unshakeable focus is what makes him nearly untouchable. Is this the start of a new era in the Sinner-Alcaraz rivalry? #Sports #Tennis #Sinner